Blue trisazo dyes



Patented June 17, 1924..

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WILLIAM: W. BAUER, OF TKURSTON, OHIO, AND HAROLD E. WOODWARD, OF PENNS- GROVE, NEW JERSEY, ASSIGNORS TO E. I. DU POINT DE NEMIOURS & COMPANY, OF WILMINGTON, DELAWARE, A CORPOBATION OF DELAWARE.

BLUE TRISAZO DYES.

Nb Drawing.

f To all whom it may concern:

Niki

V nitrite,

Fill

.tion; and R represents Be it known that we, WILLIAM W. BAUER and HAROLD E. WOODWARD, citizens of the United States, and residents of Thurston, in the county of Fairfield and State of Ohio,

and Penns 'rove, in the county of Salem and N ew Jersey, respectively, have in- State of Vented certain new and useful Blue Trisazo Dyes, of which the following is a specification.

This invention relates to trisazo dyes capable of dyeing unmordanted cotton blue shades of great brilliancy' and fastness.

BOBNB where X represents a sulphonic group in a beta position (i. e. a 6 or 7 position); Y represents a sulphonic group in a beta posiydrogen or a hydrocarbon radical such as methyl, phenyl or tolyl.

To illustrate how the new dyes may be made the following examples are given:

Example 1.19.5 kilogramsot the sodium salt of l-aminobenzene-3-sulphonic acid (metanilic acid) is diazotized at 5 C. with 9.0 kilograms of 100% hydrochloric acid and 6.9 kilograms of sodium nitrite. The solution of this diazo compound is allowed to run into a neutral solution of 245.5 kilograms 632" a mixture of the sodium salts of 1 :6 and 1:7 naphthylamine sulphonic acids (Cleves After stirring six hours, the amino-azo-.

compound thus formed is diazotized at 5 C. with 9.0 kilograms of 100% hydrochloric acid and 6.9 kilograms of sodium The resulting diazo compound is introduced into a neutral solut on contain ing 24.5 kilograms of a mixture of the sodium salts of its? and 1:7 naphthylamine sulphonic acid (Cl-aves acid) and kilograms of sodium acetate. After the coupling is completed this disazo dye is preci itated trom alkaline solution y the color. aqueous solution by the addition of hydro- Application filed December 2, 1921. Serial No. 519,403.

graphically represents the constitution of these dyes addition of common salt. It is filtered from the mother liquor and redissolved in water at C. The solution is cooled to .5" C. and diazotized with 18 kilograms of 100% hydrochloric acid and 6.9. kilograms of sodium nitrite. This diaz o compound is added to a solution containing 24.0 kilograms of 2:5 aminomaphthol 'Z-sulphonic acid (J-acid) and kilograms of sodium carbonate. The solution of the resulting dyestutf is heated to 80 C. and common salt isadded to separate the dye from its mother liq uor. The dyestufl' is thenfiltered and dried. v

The dye obtained by following the above procedure is a dark powder of bronzy appearance. It dissolves in Water with a blue The acid dye is precipitated from chloric acid. The color becomes redder in acid solution. The dye dissolves in. concentrated sulphuric acid. with a green black color and on dilution with water it comes outas a red violet flocculent precipitate. Strong reducing agents destroy the-dye, giving 1-aminobenzene 3-sulphonic acid, 12

naphthylenediamine 6 (7) sul honic acid and 2 :6-diamino 5 naphthol sulphonic acid. This gives an unmordanted cotton a. greenish blue shade of great brilliancy. The

dyeings are moderately fast to Washing,

acids, and alkalies, and extremely fast to light. (has constituent of the dye has OaNa SOuNtA the sulphonic groups of themiddle components being in beta positions.

Tn both examples the commercial Gleves acid, which is a mixture of the 1 :G-and the k of 2-amino-5 rneaere most probably the following graphical formula dark blue, and on dilution with Water it comes out as a dark blue precipitate. Strong reducing agents destroy the dye, giving 1-aminobenzene-3-sulphonic acid, 1:4c-naphthylenediamine-ti-(7)-sulphonic acid, and 2- phenylamine 6 amino- 5 aphtholl-sulphonic acid. The shade of the dyeing on cotton is greener than is given by the dye described in Example 1 but its fastness properties are the same. The dye made in accordance With this second example has most probably the following graphical formula:

1:7-naphthylaminesulphonie acids, may be substituted by either of those isomers a one.

We claim:

1. A trisazo dye or the general formula:

Where X represents a sulphonic group in a beta position; Y represents a sulphonic group in a beta position; and It represents hydrogen or a hydrocarbon radical, said dye being capable of dyeing unmordanted cotton blue shades fast to light. 4

2. A trisazo dye or the following general formulas,

where R stands for an aryl radical, and lit and lit, represent beta-sulpho-l, t-naphthyl- ,danted cotton blue where R, and R represent sulphonaphthylone radicals R, stands for a J-acid compound, and M for an inorganic radical.

3. A trisazo dye of the tollowing general formula:

man

' some one radicals, said dye yielg on orshades fast to light.

4. The new trisazo dye of ,the following formula:

in which commercial Cleves acid containing varying amounts of 1-naphthylamine-7-sulphonic acid, together with l-naphthylaminefi-sulphonic acid, is used to give the middle azo components; this dye being a dark powder of bronzy appearance, givlng a blue solution in water from which hydrochloric acid precipitates the acid dye; the dye being soluble in concentrated sulphuric acid with SOaNa SOaNe natures.

HAROLD E. WOODWARD. WILLIAM W. BAUER. 

